Ocean Fungus Kills Toxic Algae, May Control Blooms

Researchers just found a tiny ocean ally that fights toxic algae threatening beaches worldwide.

Scientists at Yokohama National University discovered a new species of marine fungus that attacks and kills harmful algae responsible for toxic blooms. The microscopic organism, named Algophthora mediterranea (which means "algae destroyer"), naturally targets algae that can make beachgoers sick with respiratory problems and skin irritation.

The fungus was first spotted in Spanish seawater in 2021 and formally identified by Professor Maiko Kagami and PhD student Núria Pou-Solà. Genetic testing revealed it's not just a new species but an entirely new type of organism, different from any marine fungus scientists had seen before.

What makes this fungus remarkable is its versatility. It can infect several different algae species and even feed on pollen grains, showing unusual adaptability for an ocean parasite. Time-lapse images captured the fungus attacking algae cells and killing them within just a few days.

The discovery matters because harmful algal blooms have become increasingly common in oceans worldwide. These outbreaks happen when algae grow rapidly due to warm water and high nutrients, releasing toxins that cause coughing, breathing problems, and skin reactions in people near the coast. Blooms of the algae this fungus targets have appeared more frequently in the Mediterranean over recent decades.

The Bright Side

This tiny destroyer could help scientists understand how nature keeps harmful algae in check. While researchers have long known about diverse ocean fungi through DNA surveys, only a handful of parasitic species have been isolated and studied until now.

"Our newly described species stands out for its unusually broad host range and distinctive feeding strategy," said Pou-Solà. The finding suggests these overlooked fungi may play a bigger role in controlling ocean ecosystems than anyone realized.

The research team plans to study how the fungus operates in complex ocean communities and how it might shape the ocean's chemical cycles. Their ultimate goal is building knowledge that could help predict and manage harmful algal blooms more effectively, protecting both marine life and people who love the coast.

Nature may have been quietly protecting our beaches all along.